ASP.Net AJAX MaskEditExtender Change AM PM for Time

Just you need to type A or P and it changes to AM or PM respectively

    <asp:ScriptManager ID="sp" runat="server">
    </asp:ScriptManager>
    <asp:TextBox ID="TextBox1" runat="server">
    </asp:TextBox>
    <cc1:MaskedEditExtender id="MaskedEditExtender1" runat="server"
        acceptampm="true"  mask="99:99:99" masktype="Time"
        messagevalidatortip="true"  
        targetcontrolid="TextBox1" autocompletevalue="00:00:00 AM">
</cc1:MaskedEditExtender>